<template>
<div>
  <div class="search">
  	<input type="text" v-model="keyword" placeholder="输入城市名或拼音" class="search-input"/>
  </div>
  <div class="search-content" ref="search" v-show="keyword">
    <ul>
      <li class="search-item border-bottom" v-for="item of list" @click="handleCityClick(item.name)">{{item.name}}</li>
      <li class="search-item border-bottom" v-show="whetherNoData">no matching data was found</li>
    </ul>
  </div>
</div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapState,mapMutations} from 'vuex'
export default {
	name: 'CityHeader',
  props: {
    cities: Object
  },
  data () {
    return {
      keyword: '',
      list: [],
      timer: null
    }
  },
  computed: {
    whetherNoData() {
      return !this.list.length
    }
    },
  watch: {
    keyword () {
      if (!this.keyword) {
        this.list = []
        return
      }
      if (this.timer) {
        clearTimeout (this.timer)
      }
      this.timer = setTimeout(() => {
        const result = []
        for(let i in this.cities) {
          this.cities[i].forEach((value) => {
            if(value.spell.indexOf(this.keyword) >-1 || value.name.indexOf(this.keyword) >-1) {
              result.push(value)
            }
          })
        }
        this.list = result
      },100)
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.search)
  },
	methods: {
		handleCityClick (city) {
			this.$store.dispatch('changeCity',city)
			//this.$store.commit('changeCity',city) 没有异步的时候就没必要调用actions了，直接调用mutations，不过我这里还是用了actions↑
			this.$router.push('/')
		},
		...mapMutations(['changeCity'])
	}
}
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.search
  height .72rem
  background: $bgColor
  padding 0 .1rem
.search-input
  height .62rem
  line-height .62rem
  width 100%
  text-align center
  border-radius .06rem
  color #666
  padding 0 .1rem
  box-sizing border-box
.search-content
  position absolute
  top 1.58rem
  left 0
  right 0
  bottom 0
  overflow hidden
  background-color #eee
  z-index 1
.search-item
  line-height .62rem
  padding-left .2rem
  color #666
  background #fff
</style>
